3, 5 आणि 7 हे अंक वापरून किती संभाव्य दोन-अंकी संख्या (अंकांची पुनरावृत्ती करण्याची परवानगी आहे) तयार केल्या जाऊ शकतात?

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RRC Group D Previous Paper 5 (Held On: 23 Sep 2018 Shift 1)
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  1. 10
  2. 9
  3. 7
  4. 8

Answer (Detailed Solution Below)

Option 2 : 9
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⇒ संभाव्य दोन-अंकी संख्या जी 3, 5 आणि 7 = 3 × 3 अंक वापरून तयार केली जाऊ शकते.

∴ 9 संभाव्य दोन अंकी संख्या तयार केल्या जाऊ शकतात.

9 संभाव्य दोन-अंकी संख्या आहेत:

33, 35, 37, 53, 55, 57, 73, 75, 77 

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